Gynecologic cancers (endometrial, ovarian, and cervical) are rare so the odds are very much in your favor that this is benign.
As far as the 18mm endometrium, up to 16mm is the normal thickness during the second half of the cycle so your lining is not that thick. And as indicated in the u/s report, they cannot exclude polyps or submucosal fibroids which can make the lining appear thicker than it is. Ovarian cysts can affect hormone production which can cause the lining to build somewhat. You are young to have either endometrial hyperplasia or cancer. Hyperplasia usually takes awhile to develop into cancer and is pretty treatable with hormonal medications but, again, chances are you do not even have that.
I have not heard of dermoid cysts being hereditary. Almost all cysts are benign (non-cancerous) and most go away on their own. However, there are certain types that do not resolve on their own including dermoids and endometriomas (both of which are benign types). Since imaging is not definitive, they cannot always tell the type of cyst as is the case for your ultrasound. A cyst that size (10cm) typically has to be surgically removed because there is risk of ovarian torsion. The key here is that if the cyst is benign, they should remove JUST THE CYST (cystectomy). You should not need to lose your ovary although surgeons remove women's ovaries all the time for cysts. But that can cause a host of problems including reduced fertility and in the worst case a surgical type "menopause." The uterus and ovaries work together as a unit and removal of an ovary, the uterus, or tubes can permanently upset the whole system.
Of course, on the rare situation of cancer, removal of the ovary (and possibly more) would likely be needed. But they can do a frozen section pathology while you are in the operating room to check the status (benign/cancer). That should dictate the course of surgery - sew you back up with all your parts (just the cyst removed) or remove the ovary (and possibly more) and stage the cancer.
The surgical consent forms tend to be fairly open-ended allowing the surgeon to remove whatever parts he/she wants. You may have to revise the form and make sure the surgeon signs off on your revisions to protect your female parts and health.
And if by chance they think this could be cancer, you will be in the best hands with a gynecologic oncologist. But even then you should not need to lose your ovary or any other organ if the frozen section is benign.
Keep us posted. I hope all ends well!
Thank you for the information. I just had my appointment today and I had bloodwork done to check my CA-125. The doctor told me to skip the mri and referred me to a Gyn/Onc I believe. She said he would be able to take the mass out and hopefully save as much of my ovary as possible.
I was told I also have a right complex cyst measuring 3.9x 2.4x4.1 cm wiith the possibility of there being a small adjacent simple cyst measuring no less than 3cm. Ehich also needs to be removed.
My doctor basically told me she does not think it is Cancer but she wants to check my complex cyst and uterus because that makes her a little nervous.
I am very stressed out about the whole situation. I have not been able to eat well since thurday and I cannot stop crying, I hope that these cysts are not Cancer.
The fact that the ultrasound said "could possibly be a hemorrhagic cyst, endometrioma or dermoid" indicates that this cyst has benign characteristics because all three of those cyst types are benign. Granted the u/s is not foolproof but they can usually get a fairly good read.
As far as the other ovary and the complex and simple cyst, a number of clustered simple cysts can be mistaken for a complex cyst. Simple cysts are rarely surgically removed unless they get too large (over 7cm or so). Of course, if you need these other cysts removed, then it probably makes sense to remove the simple one(s).
Don't freak just because your gyn sent you to an oncologist. She is just playing it safe. You will want to be sure to ask this oncologist about his cystectomy skills so that you don't have to lose either ovary if the cysts are benign.
The CA125 test is not that useful because benign conditions (including cysts) can cause an elevated result. A friend of mine had a benign cyst and her CA125 result was well over 1000 while mine was in normal range (under 36).
I believe they couldn't find my left ovary either because they didn't give me measurements like they did for my right one. I have been very anxious, stressed and can't stop crying. I can't eat or sleep. I feel so alone because my mom as well is very easy going and tells me I will be ok. They don't know what kind of mass/cyst I have on my left side which only makes me more nervous. I don't know what to do anymore, and the fact that they sent me straight to a gynecologist/oncologist makes me even more nervous. Did your doctor say anything else? did any blood tests or refer you to a specialist? My mass needs to be removed because it is the size of a grapefruit. My right ones arent huge but since they are complex cysts my obgyn told me those made her a little nervous.
As far as them not being able to see your ovary on ultrasound, that is probably because the cyst has encapsulated it. The ovary is the size of an almond. So it doesn't take but a very small cyst (far less than 1cm) to overtake it. That is why removing just the cyst is a more delicate surgery than removing the ovary. They have to cut the cyst from around the ovary probably akin to coring an apple (where the ovary is the core).
Try to remain calm. Make a list of questions to ask so you don't forget any. Teratoma is usually used interchangeably with dermoid and that type of cyst is benign (non-cancerous). Anechoic typically indicates a simple cyst that is a normal part of the menstrual cycle. Plus neither of these cysts are larger than 7cm so surgery should not be imminent...in other words there is likely no need to rush into doing anything. Take the time to do your research and make sure you are getting proper / conservative care that will preserve your ovaries. These links are helpful:
http://radiopaedia.org/articles/ovarian-cyst-2
http://radiopaedia.org/articles/mature-cystic-ovarian-teratoma